Selective shifting tool



Dec. 3, 1968 J. T. ZAK

SELECTIVE SHIFTING TOOL A'ORMEV Filed Nov. 20, 1967 United States PatentOihce 3,414,060 Patented Dec. 3, 1968 3,414,060 SELECTIVE SHIFTING TOOLJoseph T. Zak, P.O. Box 119, Telferner, Tex. 77988 Filed Nov. 20, 1967,Ser. No. 684,172 Claims. (Cl. 166-214) ABSTRACT OF THE DISCLOSURE Aselective shifting tool for use in a well tubing in conjunction withshifting a sleeve and establishing cornmunication in drilling andproduction operations between the tubing and the tubing-casing annulus,comprising a mandrel having an upper and lower laterally reduced area, awire line attachment at the upper end of said mandrel for connectionwith a wire line and lowering the tool into a shiftable sleeve to engageand shift said sleeve to move the ports thereof in alignment with theports in the tubing, thus establishing communication with thetubingcasing annulus, or in the event of multiple completion,establishing connection with another zone where pressure of the otherzone is greater than the tubing pressure, and a pair of expansible keyson said mandrel having means for constantly urging said keys outwardly,to lock the keys in the sleeve to be shifted, retainer rings on saidkeys and means for maintaining said retainer rings in position, .meanson said mandrel for Irele'asably anchoring said keys thereon andretrieving means on the lower end of said mandrel for receiving andcompressing said keys for retrieving said tool.

SUMMARY OF THE INVENTION A selective shifting tool having a mandrel,means for attaching a wire line to said mandrel, said mandrel havingupper and lower laterally reduced areas and a pair of expansible keysmounted on said mandrel, upper and lower retainer rings on said keys,means for maintaining said rings `on said keys and the lower retainerring being detachably mounted on said mandrel, an anchor ring detachablymounted on said mandrel below said retainer ring, collets on said lowerretainer ring movable into engagement with said anchor ring, and aretrieving means on the bottom of said mandrel.

BRIEF DESCRIPTION OF THE DRAWINGS FIGURE 1 is an elevation of thedevice, showing the keys in running position.

FIGURE 2 is an elevational view of the device, showing the keys in asleeve and in locked position.

FIGURE 3 is a partial elevational view, showing the keys in theretrieving means, preparatory to being removed from the tubing, and

FIGURE 4 is a cross sectional view taken on the line 4-4 of FIGURE 2.

DESCRIPTION OF THE PREFERRED EMBODIMENT In the drawings, the numeral 1designates a wire line connection, detachably secured to the externallythreaded connector 2 formed on the upper end of the mandrel 3. Two sidesof the outer surface of the mandrel 3 are reduced at 4. A pair of keys5, 5 are mounted on the mandrel and are outwardly expansible. The upperretaining ring 6 its over the circumferentially reduced upper end of thekeys 5, 5 and a lower retainer ring 7 fits over the circumferentiallyreduced lower ends of the keys 5, 5, and is mounted on the mandrel 3 bythe shear pin 19. A groove in the longitudinal inside face of each keyreceives a suspension strap 8, 8 which is overturned at each end andadapted to extend over and to t in the grooves 13, 13

in one end face of the respective keys 5, 5 and to be maintained in thisposition when the mandrel 3 is extended through the rings 6, 7.

Each key 5 is shaped to provide the beveled shoulder 9 :and the straightshoulder 10, and is beveled inwardly at the lower portion as at 11terminating in the reduced area 12 which is received within the retainerring 7.

A shear pin 19 anchors the retainer ring 7 to the mandrel, anddownwardly extended collets 14 are formed on the lower end of theretainer .ring 7.

The mid portion of the mandrel 3 is enlarged as at 15, by extendingdiametrically opposed sides, and the lower portion of the mandrel 3 isreduced as at 16 to conform to the rectangular shape of the area 4, andan anchor ring 17 is secured to the mandrel 3 by a shear pin 18, and thelower end face of the ring 17 is undercut to receive the ends of thecollets 14.

Mounted on the lower end of the mandrel 3 is the retriever whichconsists of a tubular member 20 which is outwardly beleveled at itsupper end face and internally threaded at the lower end and adapted tobe m-ounted on the externally threaded base member 21, which has aninternally threaded socket 22 which receives the reduced and externallythreaded end 24 of the mandrel 3, and is anchored in position by meansof a set screw 23.

Each key 5 is provided with sockets` 27, 27, formed in the inside facethereof, to receive the springs 28. The device is assembled as shown inFIGURE 1 by placing the straps 8, 8 in the inside grooves of the keys 5,5, and the upper retainer ring on the upper end `of the keys, [and theupper end of the mandrel inserted ythrough the keys until the lower endof the keys passes into the upper end of the lower retainer ring 7. Thewire line connector 1 is then secured to the mandrel and the tool is inrunning position, ready to be lowered into a string Iof tubing, 33. Thetool may pass through any number of shiftable sleeves until the level isreached where it is desired to establish communication, and when theshoulders 10 pass the inside :annular shoulders of the shiftable sleeve,as 31, in the string at the desired level, the keys 5, 5 will haveexpanded outwardly, and as the tool is raised, the shoulders 10 engagethe upper inside shoulder of the sleeve, then the tool is jarredupwardly, severing the `shear pin 19, and drawing the mandrel 3upwardly, moving the section 15 of the mandrel between the keys, lockingthem in their outwardly expanded position in the sleeve, and shiftingthe sleeve 31, moving the ports 32 to aligned position with the ports30, and establishing communication with the tubing-casing annulus. Thecollets 14 will be locked on to the anchor ring 17, the ring 17 movingupwardly with the mandrel, and the inwardly turned lower ends of thecollets passing over the ring 17 and under the lower end face of saidring 17 into the undercut area thereof. In this position the pressurefrom the outside of the tubing, if in excess of the pressure in thetubing, will move through the ports into the tubing and sleeve, but thepositive lock of the mandrel and keys in the sleeve will prevent forcingthe tool upwardly in the tubing and blowing out of the well, and whenthe pressure in the tubing and tubing-casing lannulus is equalized, thetool is again jarred upwardly, shearing the pin 18, and drawing themandrel upwardly, moving the reduced portion 16 between the keys 5, 5and permitting the keys to be retracted and to pass into the tubing 20of the retriever, so that the keys will clear the shoulders of thesleeve 31, and the tool readily withdrawn from the tubing.

' While the foregoing is considered a preferred form of the invention,it is by way of illustration only, the broad principle -of the inventionbeing dened by the appended claims.

What I claim is:

1. In a selective shifting tool, a mandrel, a pair of keys mounted onsaid mandrel and being laterally expansible thereon, an upper and lowerretainer ring mounted on said keys, said lower retainer ring beingdetachably secured to said mandrel and having downwardly extendingcollets, an anchor ring detachably secured to said mandrel and spacedfrom said lower retainer ring, and a retriever mounted on the lower endof said mandrel.

2. The device dened in claim 1 wherein said keys are shaped to provide ashoulder adapted to engage the shoulder of a sleeve in a tubing to beshifted and said mandrel having means for releasably locking said keysagainst upward movement in said tubing.

3. The device defined in claim 1 wherein said keys are shaped to engageand shift a sleeve in a tubing into communicating position with thecasing and to maintain said keys against upward movement in the tubinguntil pressure in the tubing and casing are equalized, said mandrelbeing shaped to expand or contract said keys as it is moved intodifferent positions.

4. The device dened in claim 1 wherein said keys are shaped to engageand shift a sleeve in a tubing and having means for maintaining saidkeys against upward movement in said tubing until the pressure in thetubing and casing .are equalized, said mandrel being shaped to expandand lock said keys when in one position and to release said keys andpermit their retraction when in another position and means on saidmandrel to retract and to maintain said keys in retracted position whilethe tool is withdrawn from the well.

5. The device dened in claim 1 wherein said retriever consists of atubular member detachably mounted on said mandrel with the lowermost endthereof.

References Cited UNITED STATES PATENTS l AMES A. LEPPINK, PrimaryExaminer.

